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False Black Widow (Steatoda grossa)
Photo#238082
Copyright © 2008
Peter Devereaux
Cobweb Spider -
Steatoda grossa
Coos Bay, Coos County, Oregon, USA
October 28, 2008
Size: 5/16"
Found several of these when moving a pile of wood. Believe them to be Family Theridiidae but need a confirmation and further ID would be appreciated.
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Contributed by
Peter Devereaux
on 4 November, 2008 - 11:25pm
Last updated 18 October, 2009 - 8:55am
Moved
Moved from
Steatoda
.
…
John R. Maxwell
, 18 October, 2009 - 8:55am
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Looks like one of the
Steatoda
…
John R. Maxwell
, 5 November, 2008 - 12:28am
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Steatoda
Thanks John, I reviewed the guide pages and I would agree with Steatoda. There is a good match with an image submitted by Ken Schneider in Oct. I'm not sure I would agree with his "possibly Grossa" unless this is an immature specimen and I would think it is rather late in the season for immature sightings.
…
Peter Devereaux
, 5 November, 2008 - 11:50am
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S. grossa
I'm 96% sure this is a recently molted (probably within 1.5 weeks) penultimate female of the
grossa
species. And
grossas
are year-round spiders. The females can live up to six years or more in the right conditions, although the males only make it a year or so. Granted, there is more actual mating going on during the Spring, Summer, and Fall months. But after mating, the female can withhold the sperm and lay eggs whenever she wants...and can actually make 3-6 eggs sacks after having mated only once. She can spread them out, too...laying one every few weeks instead of all at once, for example. This information is from my personal experience rearing and keeping
grossas
, not to mention the fact that my house is full of them...so if an arachnologist reads this and needs to correct my information, I apologize. I am not trying to mislead anyone. I'm just spreading what I've learned.
…
Mandy Howe
, 18 October, 2009 - 3:48am
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